Title of article :
Effect of 0.2% Chlorhexidine and Alcohol- Free Listerine on Microhardness of Major Plus Acrylic Denture Teeth
Author/Authors :
Ansari Lari, H prosthodontics Dept - Member ship of Dental Material Research Center - Dental Faculty - Tehran Medical Sciences - Islamic Azad University - Tehran, Iran , Mobayeni, MR prosthodontics Dept - Dental Faculty - Tehran Medical Sciences - Islamic Azad University - Tehran, Iran , Bolandian, P prosthodontics Dept - Dental Faculty - Tehran Medical Sciences - Islamic Azad University - Tehran, Iran , Memaran, SH prosthodontics Dept - Dental Faculty - Tehran Medical Sciences - Islamic Azad University - Tehran, Iran , Tavasoli, M Oral and Maxillofacial Surgery Dept - faculty of Dentistry - Tehran Medical Sciences - Islamic Azad University - Tehran, Iran , Basirzadeh, H No affiliation
Abstract :
The hardness and wear resistance of denture teeth have great
importance in the longevity of dentures. This study assessed the effect of 0.2% chlorhexidine
(CHX) and alcohol-free Listerine on the microhardness of acrylic denture
teeth.
Materials and Methods: In this in-vitro experimental study, 26 Major Plus teeth
were randomly divided into three groups for immersion in 0.2% CHX, alcohol-free
Listerine, and distilled water. Two teeth were not immersed in mouthwash to assess
baseline microhardness. The teeth were mounted in wax blocks (20×20×6 mm), which
underwent wax burnout and were replaced with heat-cure acrylic resin. The samples
were immersed in the solutions for 120 minutes corresponding to 4 months of clinical
service. They were removed from the solutions twice daily, each time for 30 seconds,
rinsed with distilled water, and placed again in the solutions. Next, they were stored at
room temperature for 24 hours. They were thermocycled and subjected to microhardness
measurement at the incisal third of their labial surface using the Vickers test. Data
were analyzed using t-test.
Result: The baseline microhardness (n=2) was 27.9±0.98. The microhardness of samples
immersed in CHX was 12 units (36.8%) lower than that of samples immersed
in distilled water; this difference was statistically significant (P<0.002). The microhardness
of samples in Listerine was 7.4 units (29.4%) lower than that of samples in
distilled water with no statistically significant difference (P=0.1).
Conclusion:Immersion of acrylic teeth in 0.2% CHX can significantly decrease their
microhardness. The effect of non-alcoholic Listerine on microhardness is similar to
that of distilled water.
Keywords :
Materials Testing , Acrylic Resins , Artificial Teeth , Chlorhexidine Hardness , Non-alcoholic Listerine
Journal title :
Journal of Research in Dental and Maxillofacial Sciences